padLeft function
Implementation
Uint8List padLeft(Uint8List d, int alignBytes) {
int padLength = alignBytes - d.length % alignBytes;
if(padLength == alignBytes) {
padLength = 0;
}
var filled = List<int>.filled(padLength, 0);
return Uint8List.fromList(Uint8List.fromList(filled) + d);
}